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O. E. SORIBNER.

GUT-OUT FOR ELEOTRIO- ARC LAMPS.

' No. 423,638. Patented Mar. 18, 1890.

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C. E. SURIBNER. GUT-OUT FOR ELECTRIC ARC LAMPS.

No. 423,638. Patented Mar. 18,1890.

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UNITED STATES PATENT OFFICE.

CHARLES E. SCRIBNER, OF CHICAGO, ILLINOIS, ASSIGNOR TO THE IVESTERN ELECTRIC COMPANY, OF SAME PLACE.

CUT-OUT FOR ELECTRIC-ARC LAMPS.

SPECIFICATION forming part of Letters Patent No. 423,638, dated March 18, 1890.

Application filed October 26, 1889. Serial No. 328,253- (No model.)

T at whom it may concern; tail the operation of the clutch, the lever car- Be it known that I, CHARLES E. SCRIBNER, a rying the same, or the system of levers con- 7 citizen of the United States, residing at Chitrolled by the magnets by means of which cage, in the county of Cook and State of Illithe carbon is fed to maintain the arc during nois, have invented a certain new and useful the time of the service of the lamp.

Improvement in Automatic Cut-Outs for Elec- My invention relates more particularly to tric-Arc Lamps, (Case 211,) of which the foltho winding of the lifting-magnet a and the lowing is a full, clear, concise, and exact deconnections of those windings with the carscription, reference being had to the accombon rod and the circuit through the lamp.

1o panying drawings, formingapart of this speci- Thus we will consider, as shown in Fig. i, the fication. hook o, as connected. with the line'in and the The object of my invention is to provide for hook at as connected with the line out. The automatically cutting out one lamp of several line 6 from hook 0 passes through the coils of from a circuit when its carbons are consumed, magnet a in one direction to connection f,

15 so that the circuit of the other lamps in the and then, when the lamp is burning, through same series will not be interrupted or in any the are and out by wire g. IVhen, however, wise impaired. the carbons are in contact, the clutch-lever h My invention consists in a differentiallywill rest upon the contact t. Vhen circuitis wound lifting magnet with circuits and thus closed between lever hand contact 2', we

20 switching apparatus connected therewith and have a circuit from point f through said lever so arranged that when the descent of the rod h to contact 1, and thence back through the is arrested, or, in short,when for any cause the other winding of the coils of magnet a and are becomes abnormally long, it will go out by wire 7t to wire leading out-that is to and the circuit will be maintained through say, lever 71, when closed 011 contact '5, com- 25 the diiferent coils of the lifting-magnet, so as pletes a shunt-circuit around the are, said to neutralize the same. shunt-circuit including a winding of the lift- My invention will be readilyunderstood by ing magnet. reference to the accompanying drawings, in The operation of my lamp is briefly as folwhich lows: The current being established and the 0 Figure 1 is a side elevation illustrative of carbons being together, the lifting-magnets a the'regulating mechanism of an arc lamp emwill be energized, so as to attract the armabodying my invention. Fig. 2 is a plan view ture Z. The current will pass from the point of the same. Fig. 3 is a detailed view of the fin two directions-in one direction through hand-switch. Fig. 4 is a diagram illustrative the carbons and in the other direction through 3 5 of the circuits. the contacte'and the coil of the magnet acon- Like parts are indicated by similar letters nected therewith. The whole current will of of reference throughout the different figures. course pass through one winding of the lifting- The lifting-magn et a is wound differentially, magnet to the pointjlwhere the circuit divides, each winding being of, say, from one-tenth to going in one direction through the carbons and 40 on e-fifth of an ohms resistance, or thereabout, in the other direction back differentially c according to circumstances. The regulating through the other winding of the lifting magmagnet b is included in the ordinary manner net. As the two differential windings of the in the shunt of the arc, and is of high resistlifting-magnet are of the same number of conance-say two hundred ohms. The liftingvolutions and of substantially the same re- 5 magnet, when the lamp is brought into cirsistance, and as the current through one of 5 cuit and while the lamp is burning, performs the windings is weaker on account of the cirits usual functions, and the same may be said cuit through the carbons, the lifting-magnet of the regulating or feeding magnet 12 in the will be suiiiciently energized to attract the shunt of the arc. armature Z, and thus through the interme go I do not deem it necessary to describe in dcdiatc lever shown raise the clutclrlever and cause the clutch to grasp the rod to separate the carbons and establish the arc, the contact between the lifting-lever 7L and the contact i being broken upon the first movement of the clutch-lever. The whole current will accordingly pass through the carbons and the lift ing-magnet will be energized during the burning of the lamp. \Vhen the rod in its descent is arrested by its stop or otherwise so as to draw an abnormally long arc, the current passing through the feed-magnet (Z will be increased and the clutch-lever will fall,

until finally it will close upon the contact This will immediately extinguish the are by shunting all the current through the other winding of the lifting-magnet that is to say, the whole current will be directed dilferentially through the two coils of the liftingmagnet, so as to neutralize the same. The carbons are thus automatically cutout of the circuit, while at the same time the circuit through the lamp is maintained unimpaired.

The switch m is adapted to be turned by hand. Thus at any time the lamp may be cut out, as shown in Fig. 3, this switch 012 being brought into contact with the spring or contact piece n, thus directing the whole current through the two opposite windings of the lifting-lilagnet c.

Having thus described my invention, I claim as new and desire to secure by Letters Patent- 1. The combination, with the diiterentiallywound lifting-magnets of an arc-regulator, of the carbons and a shunt-circuit around the carbons containing a switch so arranged that its closure directs the whole current back through the second of the differential windings of said magnet to neutralize the same, substantially as and for the purpose specified.

2. In an arc lamp, the combination, with the carbons and a shunt-circuit around the carbons, said carbons being included in a circuit leading from one of the differential windings ot' the lifting-magnet out to line and the said shunt, which includes the switchin g device, leading from the same difli'erential winding back through the other differential winding of the lamp, said switching device being operated automatically to close the shunt-circuit and rob the carbons of their current on an abnormal increase of the length of the are, thereby directing the current through the lifting-magnet differentially to neutralize the same, substantially as and for the purpose specified.

3. A circuit through one winding of a differentially-wound liftin g-magnet to a common point f, and thence through the carbons and out to line, in combination with a shunt-circuit from said common point to the clutchlever, and thence through a contact with which said lever is closed when the lever is at its lowest position back through the other wind ing of said lifting-magnet, and thence out to the common line, substantially as and for the purpose specified.

4. In an electric-arc lamp, alifting-magnet having two windings, one of said windings being connected in a shunt of the are differentially to the other winding, the said shuntwinding having included in its circuit a switch, whereby the arc is extinguished on closing the switch and the lifting-magnet de- 

